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प्रश्न
Give reason for the following:
Helium replaced hydrogen in weather observation balloons?
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उत्तर
If there is small leakage of hydrogen in a balloon, it forms a mixture with air that can explode. So helium has replaced hydrogen.
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संबंधित प्रश्न
MULTIPLE CHOICE QUESTIONS
The name hydrogen was given by
- Cavendish
- Lavoisier
- Haber
- none of these
FILL IN THE BLANK
In nature, hydrogen occurs as a .................. molecule represented as H2
Give equations for the reactions.
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Write a correctly balanced equation for the following “word equation”:
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Name a gas which burns in air or oxygen forming water.
Write a correctly balanced equation for the following:
When steam is passed over red hot iron.
Write down the “word equation” for the following reaction:
sodium hydroxide solution + zinc → ?
